<template>
  <view class="uni-navbar">
    <view :class="{ 'uni-navbar--fixed': fixed, 'uni-navbar--shadow': shadow, 'uni-navbar--border': border }"
          :style="{ 'background-color': backgroundColor }" class="uni-navbar__content">
      <uni-status-bar v-if="statusBar"/>
      <view :style="{ color: color,backgroundColor: backgroundColor }"
            class="uni-navbar__header uni-navbar__content_view">
        <view @tap="onClickLeft" class="uni-navbar__header-btns uni-navbar__header-btns-left uni-navbar__content_view">
          <view class="uni-navbar__content_view" v-if="leftIcon.length">
            <uni-icons :color="color" :type="leftIcon" size="24"/>
          </view>
          <view :class="{ 'uni-navbar-btn-icon-left': !leftIcon.length }"
                class="uni-navbar-btn-text uni-navbar__content_view" v-if="leftText.length">
            <text :style="{ color: color, fontSize: '14px' }">{{ leftText }}</text>
          </view>
          <slot name="left"/>
        </view>
        <view class="uni-navbar__header-container uni-navbar__content_view">
          <view class="uni-navbar__header-container-inner uni-navbar__content_view" v-if="title.length">
            <text class="uni-nav-bar-text" :style="{color: color }">{{ title }}</text>
          </view>
          <!-- 标题插槽 -->
          <slot/>
        </view>
        <view :class="title.length ? 'uni-navbar__header-btns-right' : ''" @tap="onClickRight"
              class="uni-navbar__header-btns uni-navbar__content_view">
          <view class="uni-navbar__content_view" v-if="rightIcon.length">
            <uni-icons :color="color" :type="rightIcon" size="24"/>
          </view>
          <!-- 优先显示图标 -->
          <view class="uni-navbar-btn-text uni-navbar__content_view" v-if="rightText.length && !rightIcon.length">
            <text class="uni-nav-bar-right-text">{{ rightText }}</text>
          </view>
          <slot name="right"/>
        </view>
      </view>
    </view>
    <view class="uni-navbar__placeholder" v-if="fixed">
      <uni-status-bar v-if="statusBar"/>
      <view class="uni-navbar__placeholder-view"/>
    </view>
  </view>
</template>

<script>
import uniStatusBar from "../uni-status-bar/uni-status-bar.vue";
import uniIcons from "../uni-icons/uni-icons.vue";

/**
 * NavBar 自定义导航栏
 * @description 导航栏组件，主要用于头部导航
 * @tutorial https://ext.dcloud.net.cn/plugin?id=52
 * @property {String} title 标题文字
 * @property {String} leftText 左侧按钮文本
 * @property {String} rightText 右侧按钮文本
 * @property {String} leftIcon 左侧按钮图标（图标类型参考 [Icon 图标](http://ext.dcloud.net.cn/plugin?id=28) type 属性）
 * @property {String} rightIcon 右侧按钮图标（图标类型参考 [Icon 图标](http://ext.dcloud.net.cn/plugin?id=28) type 属性）
 * @property {String} color 图标和文字颜色
 * @property {String} backgroundColor 导航栏背景颜色
 * @property {Boolean} fixed = [true|false] 是否固定顶部
 * @property {Boolean} statusBar = [true|false] 是否包含状态栏
 * @property {Boolean} shadow = [true|false] 导航栏下是否有阴影
 * @event {Function} clickLeft 左侧按钮点击时触发
 * @event {Function} clickRight 右侧按钮点击时触发
 */
export default {
  name: "UniNavBar",
  components: {
    uniStatusBar,
    uniIcons
  },
  props: {
    title: {
      type: String,
      default: ""
    },
    leftText: {
      type: String,
      default: ""
    },
    rightText: {
      type: String,
      default: ""
    },
    leftIcon: {
      type: String,
      default: ""
    },
    rightIcon: {
      type: String,
      default: ""
    },
    fixed: {
      type: [Boolean, String],
      default: false
    },
    color: {
      type: String,
      default: "#000000"
    },
    backgroundColor: {
      type: String,
      default: "#FFFFFF"
    },
    statusBar: {
      type: [Boolean, String],
      default: false
    },
    shadow: {
      type: [Boolean, String],
      default: false
    },
    border: {
      type: [Boolean, String],
      default: true
    }
  },
  mounted() {
    if (uni.report && this.title !== '') {
      uni.report('title', this.title)
    }
  },
  methods: {
    onClickLeft() {
      this.$emit("clickLeft");
    },
    onClickRight() {
      this.$emit("clickRight");
    }
  }
};
</script>

<style scoped>
.uni-nav-bar-text {
  /* #ifdef APP-PLUS */
  font-size: 34rpx;
  /* #endif */
  /* #ifndef APP-PLUS */
  font-size: 32rpx;
  /* #endif */
}

.uni-nav-bar-right-text {
  font-size: 28rpx;
}

.uni-navbar__content {
  position: relative;
  background-color: #ffffff;
  overflow: hidden;
}

.uni-navbar__content_view {
  /* #ifndef APP-NVUE */
  display: flex;
  /* #endif */
  align-items: center;
  flex-direction: row;
  /* background-color: #FFFFFF;
*/
}

.uni-navbar__header {
  /* #ifndef APP-NVUE */
  display: flex;
  /* #endif */
  flex-direction: row;
  height: 44px;
  line-height: 44px;
  font-size: 16px;
  /* background-color: #ffffff;
*/
}

.uni-navbar__header-btns {
  /* #ifndef APP-NVUE */
  display: flex;
  /* #endif */
  flex-wrap: nowrap;
  width: 120rpx;
  padding: 0 6px;
  justify-content: center;
  align-items: center;
}

.uni-navbar__header-btns-left {
  /* #ifndef APP-NVUE */
  display: flex;
  /* #endif */
  width: 150rpx;
  justify-content: flex-start;
}

.uni-navbar__header-btns-right {
  /* #ifndef APP-NVUE */
  display: flex;
  /* #endif */
  width: 150rpx;
  padding-right: 30rpx;
  justify-content: flex-end;
}

.uni-navbar__header-container {
  flex: 1;
}

.uni-navbar__header-container-inner {
  /* #ifndef APP-NVUE */
  display: flex;
  /* #endif */
  flex: 1;
  align-items: center;
  justify-content: center;
  font-size: 28rpx;
}


.uni-navbar__placeholder-view {
  height: 44px;
}

.uni-navbar--fixed {
  position: fixed;
  z-index: 998;
}

.uni-navbar--shadow {
  /* #ifndef APP-NVUE */
  box-shadow: 0 1px 6px #ccc;
  /* #endif */
}

.uni-navbar--border {
  border-bottom-width: 1rpx;
  border-bottom-style: solid;
  border-bottom-color: #e5e5e5;
}
</style>